The kangaroo is a marsupial from the family Macropodidae (macropods, meaning "large foot"). In common use, the term is used to describe the largest species from this family, the red kangaroo, as well as the antilopine kangaroo, eastern grey kangaroo, and western grey kangaroo. Kangaroos are indigenous to Australia and New Guinea.

The Marsupium is a specialized pouch for protecting, carrying, and nourishing newborn Joeys. In some marsupials (e.g., kangaroos) it is a well-developed pocket. It contains the teats, to which the incompletely developed young remain attached for a considerable period, during which time they could not survive unprotected.

The young remain firmly attached to the milk-giving teats for a period corresponding roughly to the latter part of the development of the fetus in the womb of a placental mammal (eutherian).

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